Examples with PatchException io.fabric8.api.PatchException used on opensource projects

Example 21 with PatchException

use of io.fabric8.api.PatchException in project fabric8 by jboss-fuse.

the class GitPatchManagementServiceImpl method alignTo.

@Override
public boolean alignTo(Map<String, String> versions, List<String> urls, File localMavenRepository, Runnable callback) throws PatchException {
    if (aligning.getAndSet(true)) {
        return false;
    }
    try {
        if (!env.isFabric()) {
            try {
                // we probably survived fabric:create without refreshing patch-management bundle
                env = envService.determineEnvironmentType();
                File patchRepositoryLocation = new File(patchesDir, GitPatchRepositoryImpl.MAIN_GIT_REPO_LOCATION);
                getGitPatchRepository().close();
                GitPatchRepositoryImpl repository = new GitPatchRepositoryImpl(env, patchRepositoryLocation, karafHome, karafBase, karafData, patchesDir);
                setGitPatchRepository(repository);
                start();
                // let's tweak the configuration when entering fabric mode
                // this way we will track other kinds of baselines
                ensurePatchManagementInitialized();
                if (master) {
                    // let the caller know that we've configured patch management in "master" container
                    // this is mainly to push the changes from local to cluster git repository
                    // so child/ssh containers created in fabric can fetch correct baselines
                    callback.run();
                }
            } catch (Exception e) {
                throw new PatchException(e.getMessage(), e);
            }
        }
        if (env.isFabric()) {
            Git fork = null;
            try {
                ensuringLock.lock();
                String version = versions.get(env.getProductId());
                String tagName = String.format(env.getBaselineTagFormat(), version);
                // we have to be at that tag
                Git mainRepository = gitPatchRepository.findOrCreateMainGitRepository();
                fetchFabricPatchData(mainRepository);
                fork = gitPatchRepository.cloneRepository(mainRepository, true);
                gitPatchRepository.checkout(fork).setName(gitPatchRepository.getMainBranchName()).call();
                RevTag tag = gitPatchRepository.findCurrentBaseline(fork);
                if (tag != null && tagName.equals(tag.getTagName())) {
                    if (master) {
                        // and then to data/git/servlet
                        try {
                            gitPatchRepository.pushPatchBranches();
                            callback.run();
                        } catch (Exception e) {
                            Activator.log(LogService.LOG_WARNING, null, e.getMessage(), e, false);
                        } catch (Error e) {
                            // in case newer patch management calls agent which is still wired to old patch management
                            Activator.log(LogService.LOG_WARNING, null, e.getMessage(), e, false);
                        }
                    }
                    return false;
                }
                boolean baselineSwitched = handleNonCurrentBaseline(fork, version, tagName, false, true);
                if (localMavenRepository != null) {
                    try {
                        File systemRepo = getSystemRepository(karafHome, systemContext);
                        // let's copy artifacts referenced in etc/startup.properties from localMavenRepository to system
                        File etcStartupProperties = new File(karafBase, "etc/startup.properties");
                        try (FileInputStream fis = new FileInputStream(etcStartupProperties)) {
                            Properties props = new Properties();
                            props.load(fis);
                            for (String artifact : props.stringPropertyNames()) {
                                File target = new File(systemRepo, artifact);
                                File src = new File(localMavenRepository, artifact);
                                if (!target.exists() && src.isFile()) {
                                    FileUtils.copyFile(src, target);
                                }
                            }
                        }
                        // now the URLs from the passed lis
                        for (String url : urls) {
                            String path = Utils.mvnurlToPath(url);
                            if (path != null) {
                                File target = new File(systemRepo, path);
                                File src = new File(localMavenRepository, path);
                                if (!target.exists() && src.isFile()) {
                                    FileUtils.copyFile(src, target);
                                }
                            }
                        }
                    } catch (Exception e) {
                        Activator.log(LogService.LOG_ERROR, null, e.getMessage(), e, false);
                    }
                }
                return baselineSwitched;
            } catch (Exception e) {
                throw new PatchException(e.getMessage(), e);
            } finally {
                ensuringLock.unlock();
                if (fork != null) {
                    gitPatchRepository.closeRepository(fork, true);
                }
            }
        }
        return false;
    } finally {
        aligning.set(false);
    }
}

Example 22 with PatchException

use of io.fabric8.api.PatchException in project fabric8 by jboss-fuse.

the class GitPatchManagementServiceImpl method installProfiles.

@Override
public void installProfiles(File gitRepository, String versionId, Patch patch, ProfileUpdateStrategy strategy) {
    // remember - we operate on totally different git repository!
    // we should have version branch already checked out.
    // here we don't merge/cherry-pick anything - we're preparing new commit simply by copying
    // one set of profiles (from R patch) over another (current profile definitions from Fabric)
    // we won't have merge conflicts, but we can't simply copy profiles over, because existing profiles
    // may have custom changes
    Git git = null;
    try {
        git = Git.open(gitRepository);
        File src = new File(patch.getPatchData().getPatchDirectory(), "fabric/import/fabric/profiles");
        File dst = new File(git.getRepository().getWorkTree(), "fabric/profiles");
        // ENTESB-6003:
        // let's clean the target directory first, so we can detect file removals in patches (like moving
        // jmx.* and org.apache.karaf.command.* PIDs from jboss-fuse-full to acls profile)
        FileUtils.deleteDirectory(dst);
        dst.mkdir();
        ProfileFileUtils.copyDirectory(src, dst, strategy);
        git.add().addFilepattern(".").call();
        // remove the deletes
        for (String missing : git.status().call().getMissing()) {
            git.rm().addFilepattern(missing).call();
        }
        // commit profile changes in patch branch - ultimate commit will be the merge commit
        git.commit().setMessage("Installing profiles from patch \"" + patch.getPatchData().getId() + "\"").call();
        PatchResult result = patch.getResult();
        if (result == null) {
            result = new PatchResult(patch.getPatchData(), false, new Date().getTime(), null, null);
            patch.setResult(result);
        }
        result.getVersions().add(versionId);
        result.store();
    } catch (Exception e) {
        throw new PatchException(e.getMessage(), e);
    } finally {
        if (git != null) {
            gitPatchRepository.closeRepository(git, false);
        }
    }
}

Example 23 with PatchException

use of io.fabric8.api.PatchException in project fabric8 by jboss-fuse.

the class GitPatchManagementServiceImpl method rollback.

@Override
public void rollback(PatchData patchData) {
    Git fork = null;
    try {
        fork = gitPatchRepository.cloneRepository(gitPatchRepository.findOrCreateMainGitRepository(), true);
        Ref installationBranch = null;
        PatchKind kind = patchData.isRollupPatch() ? PatchKind.ROLLUP : PatchKind.NON_ROLLUP;
        switch(kind) {
            case ROLLUP:
                {
                    Activator.log2(LogService.LOG_INFO, String.format("Rolling back rollup patch \"%s\"", patchData.getId()));
                    // rolling back a rollup patch should rebase all user commits on top of current baseline
                    // to previous baseline
                    RevTag currentBaseline = gitPatchRepository.findCurrentBaseline(fork);
                    RevCommit c1 = new RevWalk(fork.getRepository()).parseCommit(fork.getRepository().resolve(currentBaseline.getTagName() + "^{commit}"));
                    // remember the commit to discover P patch tags installed on top of rolledback baseline
                    RevCommit since = c1;
                    RevCommit c2 = new RevWalk(fork.getRepository()).parseCommit(fork.getRepository().resolve("HEAD"));
                    RevCommit to = c2;
                    Iterable<RevCommit> mainChangesSinceRollupPatch = fork.log().addRange(c1, c2).call();
                    List<RevCommit> userChanges = new LinkedList<>();
                    for (RevCommit rc : mainChangesSinceRollupPatch) {
                        if (isUserChangeCommit(rc)) {
                            userChanges.add(rc);
                        }
                    }
                    if (env == EnvType.STANDALONE) {
                        // remove the tag
                        fork.tagDelete().setTags(currentBaseline.getTagName()).call();
                    }
                    // baselines are stacked on each other
                    RevTag previousBaseline = gitPatchRepository.findNthPreviousBaseline(fork, env == EnvType.STANDALONE ? 0 : 1);
                    c1 = new RevWalk(fork.getRepository()).parseCommit(fork.getRepository().resolve(previousBaseline.getTagName() + "^{commit}"));
                    // hard reset of main patch branch - to point to other branch, originating from previous baseline
                    fork.reset().setMode(ResetCommand.ResetType.HARD).setRef(previousBaseline.getTagName() + "^{commit}").call();
                    // reapply those user changes that are not conflicting
                    ListIterator<RevCommit> it = userChanges.listIterator(userChanges.size());
                    Status status = fork.status().call();
                    if (!status.isClean()) {
                        // unstage any garbage
                        fork.reset().setMode(ResetCommand.ResetType.MIXED).call();
                        for (String p : status.getModified()) {
                            gitPatchRepository.checkout(fork).addPath(p).call();
                        }
                    }
                    while (it.hasPrevious()) {
                        RevCommit userChange = it.previous();
                        CherryPickResult cpr = fork.cherryPick().include(userChange.getId()).setNoCommit(true).call();
                        // this time prefer user change on top of previous baseline - this change shouldn't be
                        // conflicting, because when rolling back, patch change was preferred over user change
                        handleCherryPickConflict(patchData.getPatchDirectory(), fork, cpr, userChange, true, PatchKind.ROLLUP, null, false, true);
                        // restore backed up content from the reapplied user change
                        String[] commitMessage = userChange.getFullMessage().split("\n\n");
                        if (commitMessage.length > 1) {
                            // we have original commit (that had conflicts) stored in this commit's full message
                            String ref = commitMessage[commitMessage.length - 1];
                            File backupDir = new File(patchesDir, patchData.getId() + ".backup");
                            if (isStandaloneChild()) {
                                backupDir = new File(patchesDir, patchData.getId() + "." + System.getProperty("karaf.name") + ".backup");
                            }
                            backupDir = new File(backupDir, ref);
                            if (backupDir.exists() && backupDir.isDirectory()) {
                                Activator.log2(LogService.LOG_DEBUG, String.format("Restoring content of %s", backupDir.getCanonicalPath()));
                                copyManagedDirectories(backupDir, karafBase, false, false, false);
                            }
                        }
                        gitPatchRepository.prepareCommit(fork, userChange.getFullMessage()).call();
                    }
                    gitPatchRepository.push(fork);
                    if (env == EnvType.STANDALONE) {
                        // remove remote tag
                        fork.push().setRefSpecs(new RefSpec().setSource(null).setDestination("refs/tags/" + currentBaseline.getTagName())).call();
                    }
                    // remove tags related to non-rollup patches installed between
                    // rolled back baseline and previous HEAD, because rolling back to previous rollup patch
                    // (previous baseline) equal effectively to starting from fresh baseline
                    RevWalk walk = new RevWalk(fork.getRepository());
                    Map<String, RevTag> tags = gitPatchRepository.findTagsBetween(fork, since, to);
                    for (Map.Entry<String, RevTag> entry : tags.entrySet()) {
                        if (entry.getKey().startsWith("patch-")) {
                            fork.tagDelete().setTags(entry.getKey()).call();
                            fork.push().setRefSpecs(new RefSpec().setSource(null).setDestination("refs/tags/" + entry.getKey())).call();
                        }
                    }
                    // HEAD of main patch branch after reset and cherry-picks
                    c2 = new RevWalk(fork.getRepository()).parseCommit(fork.getRepository().resolve("HEAD"));
                    // applyChanges(fork, c1, c2);
                    applyChanges(fork, false);
                    break;
                }
            case NON_ROLLUP:
                {
                    Activator.log2(LogService.LOG_INFO, String.format("Rolling back non-rollup patch \"%s\"", patchData.getId()));
                    // rolling back a non-rollup patch is a revert of the patch commit and removal of patch tag
                    String patchTagName = String.format("patch-%s", env == EnvType.STANDALONE ? patchData.getId() : patchData.getId() + "-" + gitPatchRepository.getStandaloneChildkarafName());
                    ObjectId oid = fork.getRepository().resolve(patchTagName);
                    if (oid == null) {
                        throw new PatchException(String.format("Can't find installed patch (tag %s is missing)", patchTagName));
                    }
                    RevCommit commit = new RevWalk(fork.getRepository()).parseCommit(oid);
                    RevertCommand revertCommand = fork.revert().include(commit);
                    RevCommit reverted = revertCommand.call();
                    if (reverted == null) {
                        List<String> unmerged = revertCommand.getUnmergedPaths();
                        Activator.log2(LogService.LOG_WARNING, "Problem rolling back patch \"" + patchData.getId() + "\". The following files where updated later:");
                        for (String path : unmerged) {
                            Activator.log2(LogService.LOG_WARNING, " - " + path);
                        }
                        RevWalk walk = new RevWalk(fork.getRepository());
                        RevCommit head = walk.parseCommit(fork.getRepository().resolve("HEAD"));
                        Map<String, RevTag> tags = gitPatchRepository.findTagsBetween(fork, commit, head);
                        List<RevTag> laterPatches = new LinkedList<>();
                        if (tags.size() > 0) {
                            for (Map.Entry<String, RevTag> tag : tags.entrySet()) {
                                if (tag.getKey().startsWith("patch-")) {
                                    laterPatches.add(tag.getValue());
                                }
                            }
                            Activator.log2(LogService.LOG_INFO, "The following patches were installed after \"" + patchData.getId() + "\":");
                            for (RevTag t : laterPatches) {
                                String message = " - " + t.getTagName().substring("patch-".length());
                                RevObject object = walk.peel(t);
                                if (object != null) {
                                    RevCommit c = walk.parseCommit(object.getId());
                                    String date = GitPatchRepository.FULL_DATE.format(new Date(c.getCommitTime() * 1000L));
                                    message += " (" + date + ")";
                                }
                                Activator.log2(LogService.LOG_INFO, message);
                            }
                        }
                        return;
                    }
                    // TODO: should we restore the backup possibly created when instalilng P patch?
                    // remove the tag
                    fork.tagDelete().setTags(patchTagName).call();
                    gitPatchRepository.push(fork);
                    // remove remote tag
                    fork.push().setRefSpecs(new RefSpec().setSource(null).setDestination(String.format("refs/tags/%s", patchTagName))).call();
                    // HEAD of main patch branch after reset and cherry-picks
                    RevCommit c = new RevWalk(fork.getRepository()).parseCommit(fork.getRepository().resolve("HEAD"));
                    applyChanges(fork, c.getParent(0), c);
                    break;
                }
        }
    } catch (IOException | GitAPIException e) {
        throw new PatchException(e.getMessage(), e);
    } finally {
        if (fork != null) {
            gitPatchRepository.closeRepository(fork, true);
        }
    }
}

Example 24 with PatchException

use of io.fabric8.api.PatchException in project fabric8 by jboss-fuse.

the class GitPatchManagementServiceImpl method fetchPatches.

@Override
public List<PatchData> fetchPatches(URL url) throws PatchException {
    try {
        List<PatchData> patches = new ArrayList<>(1);
        File patchFile = new File(patchesDir, Long.toString(System.currentTimeMillis()) + ".patch.tmp");
        InputStream input = url.openStream();
        FileOutputStream output = new FileOutputStream(patchFile);
        ZipFile zf = null;
        try {
            IOUtils.copy(input, output);
        } finally {
            IOUtils.closeQuietly(input);
            IOUtils.closeQuietly(output);
        }
        try {
            zf = new ZipFile(patchFile);
        } catch (IOException ignored) {
            if (!FilenameUtils.getExtension(url.getFile()).equals("patch")) {
                throw new PatchException("Patch should be ZIP file or *.patch descriptor");
            }
        }
        // patchFile may "be" a patch descriptor or be a ZIP file containing descriptor
        PatchData patchData = null;
        // in case patch ZIP file has no descriptor, we'll "generate" patch data on the fly
        // no descriptor -> assume we have rollup patch or even full, new distribution
        PatchData fallbackPatchData = new PatchData(FilenameUtils.getBaseName(url.getPath()));
        fallbackPatchData.setGenerated(true);
        fallbackPatchData.setRollupPatch(true);
        fallbackPatchData.setPatchDirectory(new File(patchesDir, fallbackPatchData.getId()));
        fallbackPatchData.setPatchLocation(patchesDir);
        if (zf != null) {
            File systemRepo = getSystemRepository(karafHome, systemContext);
            try {
                List<ZipArchiveEntry> otherResources = new LinkedList<>();
                boolean skipRootDir = false;
                for (Enumeration<ZipArchiveEntry> e = zf.getEntries(); e.hasMoreElements(); ) {
                    ZipArchiveEntry entry = e.nextElement();
                    if (!skipRootDir && entry.isDirectory() && (entry.getName().startsWith("jboss-fuse-") || entry.getName().startsWith("jboss-a-mq-"))) {
                        skipRootDir = true;
                    }
                    if (entry.isDirectory() || entry.isUnixSymlink()) {
                        continue;
                    }
                    String name = entry.getName();
                    if (skipRootDir) {
                        name = name.substring(name.indexOf('/') + 1);
                    }
                    if (!name.contains("/") && name.endsWith(".patch")) {
                        // patch descriptor in ZIP's root directory
                        if (patchData == null) {
                            // load data from patch descriptor inside ZIP. This may or may not be a rollup
                            // patch
                            File target = new File(patchesDir, name);
                            extractZipEntry(zf, entry, target);
                            patchData = loadPatchData(target);
                            // ENTESB-4600: try checking the target version of the patch
                            Version version = Utils.findVersionInName(patchData.getId());
                            if (version.getMajor() == 6 && version.getMinor() == 1) {
                                throw new PatchException("Can't install patch \"" + patchData.getId() + "\", it is released for version 6.1 of the product");
                            }
                            patchData.setGenerated(false);
                            File targetDirForPatchResources = new File(patchesDir, patchData.getId());
                            patchData.setPatchDirectory(targetDirForPatchResources);
                            patchData.setPatchLocation(patchesDir);
                            target.renameTo(new File(patchesDir, patchData.getId() + ".patch"));
                            patches.add(patchData);
                        } else {
                            throw new PatchException(String.format("Multiple patch descriptors: already have patch %s and now encountered entry %s", patchData.getId(), name));
                        }
                    } else {
                        File target = null;
                        String relativeName = null;
                        if (name.startsWith("system/")) {
                            // copy to ${karaf.default.repository}
                            relativeName = name.substring("system/".length());
                            target = new File(systemRepo, relativeName);
                        } else if (name.startsWith("repository/")) {
                            // copy to ${karaf.default.repository}
                            relativeName = name.substring("repository/".length());
                            target = new File(systemRepo, relativeName);
                        } else {
                            // other files that should be applied to ${karaf.home} when the patch is installed
                            otherResources.add(entry);
                        }
                        if (target != null) {
                            // we unzip to system repository
                            extractAndTrackZipEntry(fallbackPatchData, zf, entry, target, skipRootDir);
                        }
                    }
                }
                File targetDirForPatchResources = new File(patchesDir, patchData == null ? fallbackPatchData.getId() : patchData.getId());
                // now copy non-maven resources (we should now know where to copy them)
                for (ZipArchiveEntry entry : otherResources) {
                    String name = entry.getName();
                    if (skipRootDir) {
                        name = name.substring(name.indexOf('/'));
                    }
                    File target = new File(targetDirForPatchResources, name);
                    extractAndTrackZipEntry(fallbackPatchData, zf, entry, target, skipRootDir);
                }
            } finally {
                if (zf != null) {
                    zf.close();
                }
                if (patchFile != null) {
                    patchFile.delete();
                }
            }
        } else {
            // If the file is not a zip/jar, assume it's a single patch file
            patchData = loadPatchData(patchFile);
            // no patch directory - no attached content, assuming only references to bundles
            patchData.setPatchDirectory(null);
            patchFile.renameTo(new File(patchesDir, patchData.getId() + ".patch"));
            patches.add(patchData);
        }
        if (patches.size() == 0) {
            // let's use generated patch descriptor
            File generatedPatchDescriptor = new File(patchesDir, fallbackPatchData.getId() + ".patch");
            FileOutputStream out = new FileOutputStream(generatedPatchDescriptor);
            try {
                fallbackPatchData.storeTo(out);
            } finally {
                IOUtils.closeQuietly(out);
            }
            patches.add(fallbackPatchData);
        }
        return patches;
    } catch (IOException e) {
        throw new PatchException("Unable to download patch from url " + url, e);
    }
}

Example 25 with PatchException

use of io.fabric8.api.PatchException in project fabric8 by jboss-fuse.

the class ServiceImpl method featureUpdatesInPatch.

/**
 * Returns a list of {@link FeatureUpdate} for single patch, taking into account already discovered updates
 * @param patch
 * @param updatesForFeatureKeys
 * @param kind
 * @return
 */
private List<FeatureUpdate> featureUpdatesInPatch(Patch patch, Map<String, FeatureUpdate> updatesForFeatureKeys, PatchKind kind) throws Exception {
    Set<String> addedRepositoryNames = new HashSet<>();
    HashMap<String, Repository> after = null;
    try {
        List<FeatureUpdate> updatesInThisPatch = new LinkedList<>();
        /*
             * Two pairs of features makes feature names not enough to be a key:
             * <feature name="openjpa" description="Apache OpenJPA 2.2.x persistent engine support" version="2.2.2" resolver="(obr)">
             * <feature name="openjpa" description="Apache OpenJPA 2.3.x persistence engine support" version="2.3.0" resolver="(obr)">
             * and
             * <feature name="activemq-camel" version="5.11.0.redhat-621039" resolver="(obr)" start-level="50">
             * <feature name="activemq-camel" version="1.2.0.redhat-621039" resolver="(obr)">
             */
        // install the new feature repos, tracking the set the were
        // installed before and after
        // (e.g, "karaf-enterprise-2.4.0.redhat-620133" -> Repository)
        Map<String, Repository> before = new HashMap<>(getAvailableFeatureRepositories());
        for (String url : patch.getPatchData().getFeatureFiles()) {
            featuresService.addRepository(new URI(url));
        }
        after = getAvailableFeatureRepositories();
        // track which old repos provide which features to find out if we have new repositories for those features
        // key is name|version (don't expect '|' to be part of name...)
        // assume that [feature-name, feature-version{major,minor,0,0}] is defined only in single repository
        Map<String, String> featuresInOldRepositories = new HashMap<>();
        // key is only name, without version - used when there's single feature in old and in new repositories
        MultiMap<String, String> singleFeaturesInOldRepositories = new MultiMap<>();
        Map<String, Version> actualOldFeatureVersions = new HashMap<>();
        for (Repository existingRepository : before.values()) {
            for (Feature feature : existingRepository.getFeatures()) {
                Version v = Utils.getOsgiVersion(feature.getVersion());
                Version lowestUpdateableVersion = new Version(v.getMajor(), v.getMinor(), 0);
                // assume that we can update feature XXX-2.2.3 to XXX-2.2.142, but not to XXX-2.3.0.alpha-1
                String key = String.format("%s|%s", feature.getName(), lowestUpdateableVersion.toString());
                featuresInOldRepositories.put(key, existingRepository.getURI().toString());
                singleFeaturesInOldRepositories.put(feature.getName(), existingRepository.getURI().toString());
                actualOldFeatureVersions.put(key, v);
            }
        }
        // Use the before and after set to figure out which repos were added.
        addedRepositoryNames = new HashSet<>(after.keySet());
        addedRepositoryNames.removeAll(before.keySet());
        // track the new repositories where we can find old features
        Map<String, String> featuresInNewRepositories = new HashMap<>();
        MultiMap<String, String> singleFeaturesInNewRepositories = new MultiMap<>();
        Map<String, String> actualNewFeatureVersions = new HashMap<>();
        MultiMap<String, String> singleActualNewFeatureVersions = new MultiMap<>();
        // Figure out which old repos were updated:  Do they have feature
        // with the same name as one contained in a repo being added?
        // and do they have update'able version? (just like with bundles)
        Set<String> oldRepositoryNames = new HashSet<String>();
        for (String addedRepositoryName : addedRepositoryNames) {
            Repository added = after.get(addedRepositoryName);
            for (Feature feature : added.getFeatures()) {
                Version v = Utils.getOsgiVersion(feature.getVersion());
                Version lowestUpdateableVersion = new Version(v.getMajor(), v.getMinor(), 0);
                String key = String.format("%s|%s", feature.getName(), lowestUpdateableVersion.toString());
                featuresInNewRepositories.put(key, addedRepositoryName);
                singleFeaturesInNewRepositories.put(feature.getName(), addedRepositoryName);
                actualNewFeatureVersions.put(key, v.toString());
                singleActualNewFeatureVersions.put(feature.getName(), v.toString());
                String oldRepositoryWithUpdateableFeature = featuresInOldRepositories.get(key);
                if (oldRepositoryWithUpdateableFeature == null && singleFeaturesInOldRepositories.get(feature.getName()) != null && singleFeaturesInOldRepositories.get(feature.getName()).size() == 1) {
                    oldRepositoryWithUpdateableFeature = singleFeaturesInOldRepositories.get(feature.getName()).get(0);
                }
                if (oldRepositoryWithUpdateableFeature != null) {
                    // track the old repository to be removed
                    oldRepositoryNames.add(oldRepositoryWithUpdateableFeature);
                }
            }
        }
        // We need to uninstall them. Before we uninstall, track which features were installed.
        for (String oldRepositoryName : oldRepositoryNames) {
            Repository repository = before.get(oldRepositoryName);
            for (Feature feature : repository.getFeatures()) {
                if (featuresService.isInstalled(feature)) {
                    Version v = Utils.getOsgiVersion(feature.getVersion());
                    Version lowestUpdateableVersion = new Version(v.getMajor(), v.getMinor(), 0);
                    String key = String.format("%s|%s", feature.getName(), lowestUpdateableVersion.toString());
                    String newRepositoryName = featuresInNewRepositories.get(key);
                    String newVersion = actualNewFeatureVersions.get(key);
                    if (newRepositoryName == null) {
                        // feature from 1.1.1 to 1.3.0
                        if (singleFeaturesInOldRepositories.get(feature.getName()) != null && singleFeaturesInOldRepositories.get(feature.getName()).size() == 1 && singleFeaturesInNewRepositories.get(feature.getName()) != null && singleFeaturesInNewRepositories.get(feature.getName()).size() == 1) {
                            newRepositoryName = singleFeaturesInNewRepositories.get(feature.getName()).get(0);
                        }
                    }
                    if (newVersion == null) {
                        if (singleActualNewFeatureVersions.get(feature.getName()) != null && singleActualNewFeatureVersions.get(feature.getName()).size() == 1) {
                            newVersion = singleActualNewFeatureVersions.get(feature.getName()).get(0);
                        }
                    }
                    FeatureUpdate featureUpdate = null;
                    if (newVersion != null && newRepositoryName != null) {
                        featureUpdate = new FeatureUpdate(feature.getName(), after.get(oldRepositoryName).getURI().toString(), feature.getVersion(), after.get(newRepositoryName).getURI().toString(), newVersion);
                    } else {
                        // we didn't find an update for installed features among feature repositories from patch
                        // which means we have to preserve both the feature and the repository - this may
                        // be user's feature
                        featureUpdate = new FeatureUpdate(feature.getName(), after.get(oldRepositoryName).getURI().toString(), feature.getVersion(), null, null);
                    }
                    updatesInThisPatch.add(featureUpdate);
                    // Merge result
                    FeatureUpdate oldUpdate = updatesForFeatureKeys.get(key);
                    if (oldUpdate != null) {
                        Version upv = null, newV = null;
                        if (oldUpdate.getNewVersion() != null) {
                            upv = VersionTable.getVersion(oldUpdate.getNewVersion());
                        }
                        if (newVersion != null) {
                            newV = VersionTable.getVersion(newVersion);
                        }
                        if (upv == null && newV == null) {
                        // weird...
                        } else {
                            if (upv == null || (newV != null && upv.compareTo(newV) < 0)) {
                                // other patch contains newer update for the feature
                                updatesForFeatureKeys.put(key, featureUpdate);
                            }
                        }
                    } else {
                        // this is the first update of the bundle
                        updatesForFeatureKeys.put(key, featureUpdate);
                    }
                }
            }
        }
        // now let's see if there are repositories that are NOT updated (either they're not available in patch
        // (like user feature repositories) or simply didn't change (like jclouds 1.8.1 between Fuse 6.2 and 6.2.1)
        Set<String> unchangedRepositoryNames = new HashSet<>(before.keySet());
        unchangedRepositoryNames.removeAll(oldRepositoryNames);
        for (String unchangedRepositoryName : unchangedRepositoryNames) {
            Repository repository = before.get(unchangedRepositoryName);
            boolean hasInstalledFeatures = false;
            for (Feature feature : repository.getFeatures()) {
                if (featuresService.isInstalled(feature)) {
                    FeatureUpdate featureUpdate = new FeatureUpdate(feature.getName(), after.get(unchangedRepositoryName).getURI().toString(), feature.getVersion(), null, null);
                    hasInstalledFeatures = true;
                    // preserve unchanged/user feature - install after restart
                    updatesInThisPatch.add(featureUpdate);
                    // the key doesn't matter
                    updatesForFeatureKeys.put(String.format("%s|%s", feature.getName(), feature.getVersion()), featureUpdate);
                }
            }
            if (!hasInstalledFeatures) {
                // we have to preserve unchanged/user feature repository - even if it had no installed features
                // this featureUpdate means - "restore feature repository only"
                FeatureUpdate featureUpdate = new FeatureUpdate(null, after.get(unchangedRepositoryName).getURI().toString(), null, null, null);
                updatesInThisPatch.add(featureUpdate);
                updatesForFeatureKeys.put(String.format("REPOSITORY_TO_ADD:%s", after.get(unchangedRepositoryName).getURI().toString()), featureUpdate);
            }
        }
        return updatesInThisPatch;
    } catch (Exception e) {
        throw new PatchException(e.getMessage(), e);
    } finally {
        // we'll add new feature repositories again later. here we've added them only to track the updates
        if (after != null) {
            for (String repo : addedRepositoryNames) {
                if (after.get(repo) != null) {
                    featuresService.removeRepository(after.get(repo).getURI(), false);
                }
            }
        }
    }
}